2000 Chevy Blazer Oxygen Sensor Located. Oxygen sensors after the catalytic converter are “downstream sensors”. Figures 10 through 12 below show the removal of the b2/s1 (passenger's side) o2 sensor.
O2 sensors are located on the muffler located in the back there are 2 o2 sensors each costing about $70 each at your local auto zone hope this helps elia where is the o2 sensor located on a 2000. Depending on the year of the truck, there will be just one sensor located on the passenger side near the transmission, or several sensors on the later models, located both before and after the catalytic converters. Pull off the o2 sensor.